Once you have downloaded the .zip file, follow these steps to install it on your system: Barcodes, Inc. Free Barcode Font - Code 39 True Type - Barcodesinc.com

Several reliable sites offer the genuine "Free 3 of 9" font family as freeware for both personal and commercial use:

The barcode font is a popular and versatile tool for businesses and individuals who need to generate professional barcodes without expensive software. Created by Matthew Welch, this font implements the Code 39 (also known as "Code 3 of 9") standard, specifically the Extended version which supports the full ASCII 128 character set. What is the Free 3 of 9 Extended Barcode Font?

The 3 of 9 standard is a widely used barcode symbology for internal inventory tracking and document management.